<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>学习css</title>
		<style>
			@import url(学习css3.css);
			p{
				background-color: aqua;
			}
		</style>
			<link rel="stylesheet" href="学习css3.css"/>
	</head>
	<body>
			<p align="center">lorem</p>
			<p align="center">lorem</p>
			<p style="text-align: center;color: red;">lorem</p>
			<p align="center">lorem</p>
			<p align="center">lorem</p>
		<span>今天</span>是周四，<span>明天</span>是周五，<span>后天</span>是放假
	</body>
</html>